Influence of Rootstock on Bud Break, Period of Anthesis, Fruit Set, Fruit Ripening, Heat Unit Requirement and Berry Yield of Commercial Grape Varieties

An experiment was conducted to study the impact of commercial grape varieties (Thompson seedless, Flame seedless and Kishmish chorni) and grafted on different root stocks (1103 P, SO4, Dog ridge) for bud break, period of anthesis, fruit set, fruit ripening, heat unit requirement and fruit yield (kg haG1). Among varieties, Flame seedless significantly took less number of days for bud break (10.13 days). Among rootstocks, own rooted vines (10.18 days) took less days for bud break and varieties grafted on Dog ridge (12.55 days) took more days for bud. Among varieties, Flame seedless took minimum number of days for anthesis (51.13 days), fruit set (58.82 days), fruit ripening (159.00 days) and heat units (2148 degree days) and among varieties grafted on own root system also took minimum number of days for anthesis (50.48 days), fruit set (57.85 days), fruit ripening (155.00 days) and heat units (2072.23 degree days). Among varieties, Kishmish chorni (11.76 kg/vine) recorded highest yield per vine followed by Thompson seedless (10.55 kg/vine) and Flame seedless (8.42 kg/vine). Among rootstocks, Dogridge produced highest yield of 13.06 kg/vine irrespective of the varieties and lowest yields (7.89 kg/vine) were recorded in case of SO4 rootstocks, which is lesser than yield obtained from own rooted vines. The interaction between varieties and rootstocks was found to be significant indicating the influence of rootstocks on different varieties.